Q: Which functional group is found in amino acids and is responsible for their basic properties?

Amino group ($$\mathrm{\text{-}NH_2$})$$

Question 1

Which property of carbon makes it uniquely suited as the backbone of biological molecules?

Accepted Answer

It can form up to four covalent bonds, allowing for complex and diverse molecular structures.

Question 2

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule consisting entirely of carbon and hydrogen atoms.

Question 3

Isomers are molecules that:

Accepted Answer

Have the same molecular formula but different structural arrangements.

Question 4

Which functional group is found in amino acids and is responsible for their basic properties?

Accepted Answer

Amino group ($$\mathrm{	ext{-}NH_2$})$$

Question 5

Which process links monomers together to form polymers, and what is a byproduct of this reaction?

Accepted Answer

Dehydration synthesis; water ($$\mathrm{H_2O}) is $$released.

Question 6

Which of the following is NOT a class of biomolecule?

Accepted Answer

Minerals

Question 7

A patient is diagnosed with a genetic disorder that affects the formation of glycosidic linkages. Which biomolecule's structure and function would be most directly impacted?

Accepted Answer

Carbohydrates

Question 8

Which of the following statements about saturated and unsaturated fatty acids is correct?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, making them solid at room temperature.

Question 9

Phospholipids are essential for cell membranes because:

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers in aqueous environments.

Question 10

Trans-fats are a health concern because:

Accepted Answer

They increase LDL (bad) cholesterol and decrease HDL (good) cholesterol, raising the risk of heart disease.

Question 11

Which of the following best describes the structure of a steroid?

Accepted Answer

Four fused carbon rings

Question 12

A protein's function is most directly determined by which level of its structure?

Accepted Answer

Primary structure (sequence of amino acids)

Question 13

A single amino acid substitution in the primary structure of hemoglobin leads to sickle-cell disease. This is an example of:

Accepted Answer

How a change at the primary level can affect all higher levels of protein structure and function.

Question 14

Which type of bond is responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 15

Denaturation of a protein involves:

Accepted Answer

The loss of its three-dimensional structure due to disruption of non-covalent interactions.

Question 16

Which of the following is a monomer of nucleic acids?

Accepted Answer

Nucleotide

Question 17

A dehydration synthesis reaction between two glucose molecules results in the formation of which disaccharide and what byproduct?

Accepted Answer

Maltose and water ($$\mathrm{H_2O})$$

Question 18

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads interact with water while their hydrophobic tails avoid water.

Question 19

Which functional group is present in all amino acids and is acidic in nature?

Accepted Answer

Carboxyl group ($$\mathrm{	ext{-}COOH})$$

Question 20

A patient with a mutation that prevents the formation of peptide bonds would be unable to:

Accepted Answer

Synthesize proteins from amino acids.

Carbon and the Molecular Diversity of Life: Study Notes

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